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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2015 Office Country | Jan. 31, 2014 | Jan. 31, 2015 Office Country | Jan. 31, 2014 | Apr. 30, 2014
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of offices | 84 kfy_NumberOfOffices |  | 84 kfy_NumberOfOffices |  |
Number of countries in which entity operates | 37 us-gaap_NumberOfCountriesInWhichEntityOperates |  | 37 us-gaap_NumberOfCountriesInWhichEntityOperates |  |
Investments in affiliated companies maximum | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage |  |
Deferred revenue | $ 43,000,000 us-gaap_DeferredRevenue |  | $ 43,000,000 us-gaap_DeferredRevenue |  | $ 36,800,000 us-gaap_DeferredRevenue
Cash equivalents | 203,500,000 us-gaap_CashEquivalentsAtCarryingValue |  | 203,500,000 us-gaap_CashEquivalentsAtCarryingValue |  | 186,600,000 us-gaap_CashEquivalentsAtCarryingValue
Realized loss of other-than-temporary impairment | 0 us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount | 0 us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount | 0 us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount | 0 us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount |
Payment of contingent consideration from acquisitions |  |  |  | 15,000,000 kfy_PaymentOfEarnOutsFromAcquisitions |
Impairment of goodwill |  |  | 0 us-gaap_GoodwillImpairmentLoss |  | 0 us-gaap_GoodwillImpairmentLoss
Impairment of intangible assets |  |  | 0 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill |  | 0 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
Performance related bonus expenses | 37,800,000 kfy_PerformanceRelatedBonusExpenses | 36,500,000 kfy_PerformanceRelatedBonusExpenses | 122,100,000 kfy_PerformanceRelatedBonusExpenses | 104,700,000 kfy_PerformanceRelatedBonusExpenses |
(Decrease) increase in performance related bonus expenses | 0 kfy_IncreaseDecreaseInPerformanceRelatedBonusExpenses | 0 kfy_IncreaseDecreaseInPerformanceRelatedBonusExpenses | (300,000)kfy_IncreaseDecreaseInPerformanceRelatedBonusExpenses | (700,000)kfy_IncreaseDecreaseInPerformanceRelatedBonusExpenses |
Performance related bonus after reduction in the previous year estimate |  |  | $ 121,800,000 kfy_PerformanceRelatedBonusAfterReductionInPreviousYearEstimate | $ 104,000,000 kfy_PerformanceRelatedBonusAfterReductionInPreviousYearEstimate |
Minimum |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Intangible assets estimated useful lives |  |  | 2 years |  |
Maximum |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Intangible assets estimated useful lives |  |  | 24 years |  |

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